Remarks

The listener is an instance of a class implementing QAMessageListeneronMessage, the only method defined in the QAMessageListener
interface. QAMessageListeneronMessage accepts a single QAMessage parameter.

The setMessageListener address parameter specifies a local queue name used to receive the message. You can only have one listener
assigned to a given queue. The selector parameter specifies a selector to be used to filter the messages to be received on
the given address.

If you want to listen for QAnywhere system messages, including push notifications and network status changes, specify "system"
as the queue name. Use this method to receive message asynchronously.